Carrier mobility, structural order, and solar cell efficiency of organic heterojunction devices
The loss mechanisms limiting solar cell efficiency in organic heterojunction photodiodes are discussed. We show that the energy loss when the exciton is split, and absence of Langevin recombination at the interface, are related to the magnitude of the electron-phonon interaction and the wavefunction extent of the electron and hole. In contrast to several recent publications, it is argued that well-ordered, high mobility organic materials will provide higher efficiency cells.
Street, R. A. Carrier mobility, structural order, and solar cell efficiency of organic heterojunction devices. Applied Physics Letters. 2008 September 29; 93 (13): 133308.